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                        序言
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        <li class="chapter " data-level="1" data-path="认识爬虫/introduceSpider.html">
            
                
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                            <b>1.</b>
                        
                        认识爬虫
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                            <b>1.1.</b>
                        
                        HTTP
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                            <b>1.2.</b>
                        
                        requests
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                            <b>1.3.</b>
                        
                        初步爬虫小项目
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                            <b>2.</b>
                        
                        正则表达式
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                            <b>2.1.</b>
                        
                        正则表达式练习
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                            <b>2.2.</b>
                        
                        正则表达式之后的第一个项目
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                            <b>2.3.</b>
                        
                        正则表达式常用表
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                            <b>2.4.</b>
                        
                        正则表达式重点
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                            <b>2.5.</b>
                        
                        正则表达式常问问题
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        <li class="chapter " data-level="2.6" data-path="正则表达式/正则爬虫练习.html">
            
                
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                            <b>2.6.</b>
                        
                        正则爬虫项目练习
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        <li class="chapter " data-level="3" data-path="XPATH/xpath-in.html">
            
                
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                            <b>3.</b>
                        
                        XPATH
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                            <b>3.1.</b>
                        
                        XPATH认识
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                            <b>3.2.</b>
                        
                        XPATH的代码例子
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        <li class="chapter " data-level="3.3" data-path="XPATH/xpath的爬虫练习.html">
            
                
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                            <b>3.3.</b>
                        
                        XPATH的爬虫练习
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        <li class="chapter " data-level="4" data-path="BeautifulSoup/BeautifulSoup.html">
            
                
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                            <b>4.</b>
                        
                        BeautifulSoup
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        <li class="chapter " data-level="4.1" data-path="BeautifulSoup/常用的css选择器.html">
            
                
                    <a href="../BeautifulSoup/常用的css选择器.html">
                
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                            <b>4.1.</b>
                        
                        常用的css选择器
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        <li class="chapter " data-level="4.2" data-path="BeautifulSoup/BeautifulSoup4的各种例子.html">
            
                
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                            <b>4.2.</b>
                        
                        BeautifulSoup4的各种例子
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                            <b>5.</b>
                        
                        ip代理池项目
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                            <b>6.</b>
                        
                        Selenium
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        <li class="chapter " data-level="7" data-path="进程线程协程/introduce.html">
            
                
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                            <b>7.</b>
                        
                        进程线程协程
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                            <b>7.1.</b>
                        
                        gevent
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        <li class="chapter " data-level="7.2" data-path="进程线程协程/green_let.html">
            
                
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                            <b>7.2.</b>
                        
                        green_let
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        <li class="chapter " data-level="7.3" data-path="进程线程协程/yield.html">
            
                
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                            <b>7.3.</b>
                        
                        yield
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        <li class="chapter active" data-level="7.4" data-path="进程线程协程/multiprecessing.html">
            
                
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                            <b>7.4.</b>
                        
                        multiprecessing
                    </a>
            
            
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        <li class="chapter " data-level="7.5" data-path="进程线程协程/threading.html">
            
                
                    <a href="../进程线程协程/threading.html">
                
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                            <b>7.5.</b>
                        
                        threading
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        <li class="chapter " data-level="8" data-path="scrapy框架/scrapy.html">
            
                
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                            <b>8.</b>
                        
                        Scrapy
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        <li class="chapter " data-level="8.1" data-path="scrapy框架/scrapy_setting.html">
            
                
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                            <b>8.1.</b>
                        
                        scrapy_setting
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        <li class="chapter " data-level="8.2" data-path="scrapy框架/模块作用.html">
            
                
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                        <i class="fa fa-check"></i>
                        
                            <b>8.2.</b>
                        
                        模块作用
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        <li class="chapter " data-level="8.3" data-path="scrapy框架/19个中间件.html">
            
                
                    <a href="../scrapy框架/19个中间件.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.3.</b>
                        
                        19个中间件
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        </li>
    
        <li class="chapter " data-level="9" data-path="scrapy-redis分布式/scrapy-redis.html">
            
                
                    <a href="../scrapy-redis分布式/scrapy-redis.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.</b>
                        
                        scrapy-redis分布式
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            <ul class="articles">
                
    
        <li class="chapter " data-level="9.1" data-path="scrapy-redis分布式/scrapy-redis的改造方法.html">
            
                
                    <a href="../scrapy-redis分布式/scrapy-redis的改造方法.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.1.</b>
                        
                        scrapy-redis的改造方法
                    </a>
            
            
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        <li class="chapter " data-level="10" data-path="spider_projects/introduce.html">
            
                
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                            <b>10.</b>
                        
                        spider_projects
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        <li class="chapter " data-level="10.1" data-path="spider_projects/使用代理在普通爬虫脚本下.html">
            
                
                    <a href="../spider_projects/使用代理在普通爬虫脚本下.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.1.</b>
                        
                        使用代理在普通爬虫脚本下
                    </a>
            
            
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        <li class="chapter " data-level="10.2" data-path="spider_projects/xpath爬取前程无忧的数据.html">
            
                
                    <a href="../spider_projects/xpath爬取前程无忧的数据.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.2.</b>
                        
                        xpath爬取前程无忧的数据
                    </a>
            
            
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        <li class="chapter " data-level="10.3" data-path="spider_projects/存储数据库的脚本.html">
            
                
                    <a href="../spider_projects/存储数据库的脚本.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.3.</b>
                        
                        存储数据库的脚本
                    </a>
            
            
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        <li class="chapter " data-level="10.4" data-path="spider_projects/weibo.html">
            
                
                    <a href="../spider_projects/weibo.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.4.</b>
                        
                        爬取央视新闻微博
                    </a>
            
            
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        <li class="chapter " data-level="10.5" data-path="spider_projects/weibo2.html">
            
                
                    <a href="../spider_projects/weibo2.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.5.</b>
                        
                        爬取明星的微博
                    </a>
            
            
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        <li class="chapter " data-level="10.6" data-path="spider_projects/liepin.html">
            
                
                    <a href="../spider_projects/liepin.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.6.</b>
                        
                        爬取猎聘的职位信息Crawl
                    </a>
            
            
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        <li class="chapter " data-level="10.7" data-path="spider_projects/zhilianRe.html">
            
                
                    <a href="../spider_projects/zhilianRe.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.7.</b>
                        
                        纯正则爬取智联的职位信息
                    </a>
            
            
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        <li class="chapter " data-level="10.8" data-path="spider_projects/setting.html">
            
                
                    <a href="../spider_projects/setting.html">
                
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                            <b>10.8.</b>
                        
                        scrapy中的setting
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.9" data-path="spider_projects/items.html">
            
                
                    <a href="../spider_projects/items.html">
                
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                            <b>10.9.</b>
                        
                        scrapy中的items
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.10" data-path="spider_projects/pipeline.html">
            
                
                    <a href="../spider_projects/pipeline.html">
                
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                            <b>10.10.</b>
                        
                        scrapy中的pipeline
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.11" data-path="spider_projects/middlewares.html">
            
                
                    <a href="../spider_projects/middlewares.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.11.</b>
                        
                        scrapy中的middlewares
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.12" data-path="spider_projects/框架中的代码运行脚本.html">
            
                
                    <a href="../spider_projects/框架中的代码运行脚本.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.12.</b>
                        
                        框架中的代码运行脚本
                    </a>
            
            
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        <li class="chapter " data-level="11" data-path="爬虫的面试题/面试题1-10.html">
            
                
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                            <b>11.</b>
                        
                        爬虫面试题
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<pre><code class="lang-python"><span class="hljs-keyword">from</span> multiprocessing <span class="hljs-keyword">import</span> Process
<span class="hljs-keyword">import</span> multiprocessing
<span class="hljs-keyword">import</span> time
<span class="hljs-comment"># 1. &#x6211;&#x4EEC;&#x9700;&#x8981;&#x751F;&#x6210;&#x4E00;&#x4E2A;&#x591A;&#x8FDB;&#x7A0B;&#x7684;&#x7C7B;</span>
<span class="hljs-comment"># 2. &#x5F00;&#x542F;&#x8FD9;&#x4E2A;&#x591A;&#x8FDB;&#x7A0B; start</span>
<span class="hljs-comment"># 3. &#x7B49;&#x5F85;&#x6240;&#x6709;&#x7684;&#x8FDB;&#x7A0B;&#x7ED3;&#x675F; join</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">task1</span><span class="hljs-params">(msg)</span>:</span>
    print(<span class="hljs-string">&apos;task1: hello, %s&apos;</span> % msg)
    time.sleep(<span class="hljs-number">1</span>)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">task2</span><span class="hljs-params">(msg)</span>:</span>
    print(<span class="hljs-string">&apos;task2: hello, %s&apos;</span> % msg)
    time.sleep(<span class="hljs-number">1</span>)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">task3</span><span class="hljs-params">(msg)</span>:</span>
    print(<span class="hljs-string">&apos;task3: hello, %s&apos;</span> % msg)
    time.sleep(<span class="hljs-number">1</span>)
<span class="hljs-keyword">if</span> __name__ == <span class="hljs-string">&apos;__main__&apos;</span>:
    <span class="hljs-comment"># &#x8F93;&#x5165;&#x7684;&#x53C2;&#x6570;target&#x662F;&#x51FD;&#x6570;&#xFF0C; args&#x662F;&#x53C2;&#x6570;</span>
    p1 = Process(target=task1, args=(<span class="hljs-string">&apos;one&apos;</span>,))
    p2 = Process(target=task2, args=(<span class="hljs-string">&apos;two&apos;</span>,))
    p3 = Process(target=task3, args=(<span class="hljs-string">&apos;three&apos;</span>,))

    start = time.time()

    p1.start()
    p2.start()
    p3.start()

    print(<span class="hljs-string">&quot;The number of CPU is:&quot;</span> + str(multiprocessing.cpu_count()))
    <span class="hljs-keyword">for</span> p <span class="hljs-keyword">in</span> multiprocessing.active_children():
        print(<span class="hljs-string">&quot;child p.name: &quot;</span> + p.name + <span class="hljs-string">&quot;\tp.id: &quot;</span> + str(p.pid))

    p1.join()
    p2.join()
    p3.join()

    end = time.time()
    print(<span class="hljs-string">&apos;3 processes take %s seconds&apos;</span> % (end - start))
</code></pre>
<h2 id="&#x8FDB;&#x7A0B;&#x6267;&#x884C;&#x7ED3;&#x679C;">&#x8FDB;&#x7A0B;&#x6267;&#x884C;&#x7ED3;&#x679C;</h2>
<pre><code class="lang-python">
The number of CPU <span class="hljs-keyword">is</span>:<span class="hljs-number">4</span>
child p.name: Process-<span class="hljs-number">2</span>    p.id: <span class="hljs-number">8456</span>
child p.name: Process-<span class="hljs-number">3</span>    p.id: <span class="hljs-number">13236</span>
child p.name: Process-<span class="hljs-number">1</span>    p.id: <span class="hljs-number">14036</span>
task1: hello, one
task2: hello, two
task3: hello, three
<span class="hljs-number">3</span> processes take <span class="hljs-number">1.9531116485595703</span> seconds
</code></pre>
<hr>
<h2 id="&#x8FDB;&#x7A0B;&#x6C60;&#x7684;&#x4EE3;&#x7801;&#x7F16;&#x5199;">&#x8FDB;&#x7A0B;&#x6C60;&#x7684;&#x4EE3;&#x7801;&#x7F16;&#x5199;</h2>
<pre><code class="lang-python"><span class="hljs-keyword">from</span> multiprocessing <span class="hljs-keyword">import</span> Pool
<span class="hljs-keyword">import</span> time


<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">task</span><span class="hljs-params">(msg)</span>:</span>
    print(<span class="hljs-string">&apos;hello, %s&apos;</span> % msg)
    time.sleep(<span class="hljs-number">5</span>)
    print(<span class="hljs-string">&apos;finished %s&apos;</span>% msg)

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">task2</span><span class="hljs-params">(msg)</span>:</span>
    print(<span class="hljs-string">&apos;Say, %s&apos;</span> % msg)
    time.sleep(<span class="hljs-number">1</span>)
    print(<span class="hljs-string">&apos;Say finish %s&apos;</span> % msg)


<span class="hljs-keyword">if</span> __name__ == <span class="hljs-string">&apos;__main__&apos;</span>:
    pool = Pool(processes=<span class="hljs-number">4</span>)

    <span class="hljs-keyword">for</span> x <span class="hljs-keyword">in</span> range(<span class="hljs-number">10</span>):
        print(<span class="hljs-string">&apos;111&apos;</span>)
        pool.apply_async(task, args=(x,))

    <span class="hljs-keyword">for</span> x <span class="hljs-keyword">in</span> range(<span class="hljs-number">5</span>):
        print(<span class="hljs-string">&apos;222&apos;</span>)
        pool.apply_async(task2, args=(x,))
    <span class="hljs-comment"># &#x6267;&#x884C;&#x5B8C;close&#x4EE5;&#x540E;&#x5C31;&#x4E0D;&#x80FD;&#x518D;&#x5411;pool&#x4E2D;&#x653E;&#x7F6E;&#x4EFB;&#x52A1;&#x4E86;</span>
    pool.close()
    pool.join()

    print(<span class="hljs-string">&apos;processes done.&apos;</span>)
</code></pre>
<h3 id="&#x8FDB;&#x7A0B;&#x6C60;&#x6267;&#x884C;&#x7ED3;&#x679C;">&#x8FDB;&#x7A0B;&#x6C60;&#x6267;&#x884C;&#x7ED3;&#x679C;</h3>
<pre><code class="lang-python"><span class="hljs-number">111</span>
<span class="hljs-number">111</span>
<span class="hljs-number">111</span>
<span class="hljs-number">111</span>
<span class="hljs-number">111</span>
<span class="hljs-number">111</span>
<span class="hljs-number">111</span>
<span class="hljs-number">111</span>
<span class="hljs-number">111</span>
<span class="hljs-number">111</span>
<span class="hljs-number">222</span>
<span class="hljs-number">222</span>
<span class="hljs-number">222</span>
<span class="hljs-number">222</span>
<span class="hljs-number">222</span>
hello, <span class="hljs-number">0</span>
hello, <span class="hljs-number">1</span>
hello, <span class="hljs-number">2</span>
hello, <span class="hljs-number">3</span>
finished <span class="hljs-number">0</span>
hello, <span class="hljs-number">4</span>
finished <span class="hljs-number">1</span>
hello, <span class="hljs-number">5</span>
finished <span class="hljs-number">2</span>
hello, <span class="hljs-number">6</span>
finished <span class="hljs-number">3</span>
hello, <span class="hljs-number">7</span>
finished <span class="hljs-number">4</span>
hello, <span class="hljs-number">8</span>
finished <span class="hljs-number">5</span>
hello, <span class="hljs-number">9</span>
finished <span class="hljs-number">6</span>
Say, <span class="hljs-number">0</span>
finished <span class="hljs-number">7</span>
Say, <span class="hljs-number">1</span>
Say finish <span class="hljs-number">0</span>
Say, <span class="hljs-number">2</span>
Say finish <span class="hljs-number">1</span>
Say, <span class="hljs-number">3</span>
Say finish <span class="hljs-number">2</span>
Say, <span class="hljs-number">4</span>
Say finish <span class="hljs-number">3</span>
Say finish <span class="hljs-number">4</span>
finished <span class="hljs-number">8</span>
finished <span class="hljs-number">9</span>
processes done.
</code></pre>

                    
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